Rabu, 20 November 2013

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Cell Cycle interphase And Mitosis

Cell cycle includes interphase and mitosis

Every cell ha particular cycle. Cell cycle is divided into two general phases, interphase and mitosis'  Interphase  is a phase that needs the  longest  period of time'  Interphase  in mammal tissues,  generally,  occurs about  12 to 24 hours. In this phase,  there occurs  growth  and preparation  for division.

During  interphase,  cell metabolism activity  is very high and cell does many  functions. In  this phase, cell size becomes  larger caused by cell growth, protein  synthesis, and cell organelle duplication.

Interphase  can be distinguished  into 3 sub-phases,  G1 ,  S and G2 .  It the  three sub-phases, cells undergo  growing  process.  Specifically,  in G1 phase, cell size becomes larger due to the cell growth. In S phase' there occurs  chromosome  duplication  and DNA  synthesis  (DNA replication) Chromosomes  that at first was single strand, finally changes  into double strand.  In G2  phase, cell grows perfectly  as a preparation  for cell division.

Mitosis  is a cell division  phase to produce somatic cell. The phase occurs about 100% of all time required  by cell cycle or about  2 hours.

Before  the mitosis stage ends,  there  is constriction  formation  in cytoplasm  that finally divisions  the cytoplasm  into  two parts. It is called Cytokinesis.  After somatic cell is formed,  the cells will undergo growing Process.  In this case, cell cycle starts  all over again

Source: Essential Biology, 2006.

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